History Film / KamenRiderXKamenRiderFourzeAndOOOMovieWarMegaMax

* MakeMeWannaShout: Kannagi's Mutamit experiments have given him the ability to do this, which he uses to repel enemies, ambush Eiji and Hina, [[spoiler:capture Nadeshiko, and kill his commanding officer once he betrays Foundation X]].

! Spoilers for all preceeding ''Franchise/KamenRider'' entries, including ''Series/KamenRiderOOO'', will be left unmarked ahead. Administrivia/YouHaveBeenWarned!

! Spoilers for ''all'' preceeding ''Franchise/KamenRider'' entries, including ''Series/KamenRiderOOO'', will be left unmarked ahead. Administrivia/YouHaveBeenWarned!

!! Spoilers for ''all'' preceeding ''Franchise/KamenRider'' entries, including ''Series/KamenRiderOOO'', will be left unmarked ahead. Administrivia/YouHaveBeenWarned!

* TheEchoer: Nadeshiko used to only be able to repeat the words being said to her by Gentaro and other people (when she's not being quiet altogether) because [[spoiler:she's a SOLU (Seeds Of Life from the Universe), an [[BlobMonster alien liquid]] that is not naturally sentient and replication is just its reflex]]. Gentaro's love for Nadeshiko became a catalyst to [[spoiler: have {{humanity ensue|s}} in her, becoming fully sentient and]] displaying a full range of human emotions and understanding, including non-echo responses.

* {{Foreshadowing}}: Not for the movie but rather for ''Fourze'' himself. [[spoiler:Everything about Nadeshiko is actually pointing viewers to hints about ''Kengo'' at the finale because they share many similarities.]]

* ItsOkayToCry: As [[spoiler:Gentaro is weeping over the death of Nadeshiko]], he's consoled by his friends stating that until he's dried all of his tears, they'll fight in his battles for him (well except JK, he can only offer a handkerchief so Gentaro can dry his eyes).

* MacguffinGirl: Nadeshiko.

* MenDontCry: Gentaro (who is known for his InelegantBlubbering and ManlyTears) claims that a man is only allowed to cry if he has [[ArsonMurderAndJaywalking lost his wallet]] or been dumped.

* SenpaiKohai: Gentarō addresses Shotarō and Philip as his and OOO's Senpai, which they take a liking to.

* SenpaiKouhai: Gentarō addresses Shotarō and Philip as his and OOO's Senpai, which they take a liking to.

* MenDontCry: Gentaro (who is known for his InelegantBlubbering) claims that a man is only allowed to cry if he has [[ArsonMurderAndJaywalking lost his wallet]] or been dumped.

* YankTheDogsChain: After going through a crisis on Nadeshiko's true identity, Gentaro decides it doesn't matter. He cares for Nadeshiko as a friend. Nadeshiko accepts it [[spoiler:and then Kannagi reverts her to her true form, ultimately killing her and ''rubbing it in Gentaro's face.]]

* WhatMeasureIsANonHuman: Kengo's original attitude to [[spoiler:Nadeshiko, viewing her as nothing more than a technological pseudo-organism that mimics human behaviour rather than a person with feelings]]. [[spoiler:When ThePowerOfLove from Gentarō causes her to develop the capacity for genuine emotion,]] Kengo changes his mind about it.

** The Seven Legendary Riders are hit with this to show how dangerous Foundation X's threat is here in the movie.

** [=V3=] fighting the [=ClayDoll=] Dopant may refer to his backstory of [[StuffedIntoTheFridge losing his family]], including his little sister, and the fact that the original [=ClayDoll=] Dopant's civilian identity, Wakana Sonozaki, was the younger sister of the Sonozaki [[BigScrewedUpFamily family]].

* {{Mooks}}: Through their research into the Gaia Memories, O Medals, and Cosmic Energy, as well as their partnerships with the [[Series/KamenRiderDouble Museum]] and Gamou, Foundation X boasts a vast foot soldier army of Masquerade Dopants (with a white suited variant transformed from Foundation X members using Gaia Memories), Waste Yummies, and Dustards. Poseidon also creates his own Waste Yummy army in ''OOO'''s portion by channeling the power of Uva's Core Medals, while in ''Fourze'''s portion Virgo leads a force of Dustards against Fourze and Nadeshiko as a favor from Gamou to Foundation X.

* HoistByTheirOwnPetard: The Super Galaxy King fired a blast of Cosmic Energy at OOO and Fourze, but [[spoiler:Nadeshiko allowed Fourze to absorb it himself and defeat Kannagi]].

[[quoteright:220:https://static.tvtropes.org/pmwiki/pub/images/220px_fourze_&_ooo_mega_max.jpg]]

* StarCrossedLovers: Gentarō doesn't take it very well when Kengo insists to him that he can't date Nadeshiko because she's basically [[spoiler:a shapeshifting puddle of space slime]]. He changes his mind eventually...[[spoiler: only for Nadeshiko to die in front of Gentaro.]]

* [[EleventhHourRanger Eleventh Hour Rider]]: [[spoiler:Kamen Rider Aqua returns from the future to help the Riders against Foundation X's forces, and give Eiji the Super [=TaToBa=] medals.]]

* MakeMeWannaShout: Kannagi's Mutamit experiments have given him the ability to do this, which he uses to repel enemies, ambush Eiji and Hina, [[spoiler:capture Nadeshiko]], and [[spoiler:kill his commanding officer once he betrays Foundation X]].

* {{Mooks}}: Through their research into the Gaia Memories, O Medals, and Cosmic Energy, as well as their partnerships with the [[Series/KamenRiderDouble Museum]] and Gamou, Foundation X boasts a vast foot soldier army of Masquerade Dopants (with a white suited variant transformed from Foundation X members using Gaia Memories), Waste Yummies, and Dustards. Poseidon also creates his own Waste Yummy army in ''OOO''[='=]s portion by channeling the power of Uva's Core Medals, while in ''Fourze''[='=]s portion Virgo leads a force of Dustards against Fourze and Nadeshiko as a favor from Gamou to Foundation X.